255686742 has 48 divisors (see below), whose sum is σ = 570679200. Its totient is φ = 82684800.

The previous prime is 255686737. The next prime is 255686771. The reversal of 255686742 is 247686552.

255686742 is a `hidden beast` number, since 25 + 568 + 67 + 4 + 2 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145992 + ... + 147732.

It is an arithmetic number, because the mean of its divisors is an integer number (11889150).

Almost surely, 2^255686742 is an apocalyptic number.

255686742 is an abundant number, since it is smaller than the sum of its proper divisors (314992458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255686742 is a wasteful number, since it uses less digits than its factorization.

255686742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1986 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 255686742 is about 15990.2076909589. The cubic root of 255686742 is about 634.7013223260.

It can be divided in two parts, 2556 and 86742, that added together give a palindrome (89298).

The spelling of 255686742 in words is "two hundred fifty-five million, six hundred eighty-six thousand, seven hundred forty-two".